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/Matplotlib 3.1

matplotlib.axes.Axes.has_data

Axes.has_data(self)

Return True if any artists have been added to axes.

This should not be used to determine whether the dataLim need to be updated, and may not actually be useful for anything.

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https://matplotlib.org/3.1.1/api/_as_gen/matplotlib.axes.Axes.has_data.html